Core-making machine



F. ZOLL.

come MAKING MACHINE.

APPLICATION FILED MAR, 18.1921.

Patented Aug. 29, 1922.

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FRED ZOLL, 0F BIRMINGHAM, ALABAMA.

CORE-'MAKTLNG- MCHINE.

Specification of Letters Patent. Patent-@d lli-11g'. 29 1922- Applcationfiled March 18, 1921. Serial No. 453,206.

particularly to poweroperated machinesfit'orthis purpose.

ln the development of ymachines of this type, the ease of insertion otthe sand, simf plicity of operation informing thecore and ease ofremoval oli the core are the essentials, togetherA with a simple methodof' changing the length ot stroke of t-he movable die portion of thecore and of changing the die it- Seli 'for different cores.

So tar as l have been able to ascertain, there has been yno othermachine for making a core olf straight simple section such as those usedas center cores in` making cast iron car wheels (or any cylindrical.,square or other straight shape) manufactured, using the saine methodsthat l have used, as other machines for making this kind of core havebeen made upon the principle oi torcing` sand through a die the sameshape as the desired core,whi .fh method is coniparatively inaccurateand docs not permit the use of any beveled ends, tapered vents, andthehke, y

as with that type ot machine the vent is a continuous hole through thesand and the core is sawcd oli' in lengths as desired. c-`

cording to mv invention the sand is placed` in a mold anrlcomprcssed tothe'desired conformation b y moving the base of the mold.

The provision of a n'iechanism well adapted .tor use on all oi the abovepoints is the object ot my invention, and l arcoinplish said object bythe certain construction and arrangement of parts to be hereina itermore speciically pointed out and claimed.

In the drawings,

Figure 1 is a :front elevation of the inachine.

Figure 2 is a top plan view showing the core box open.

Figure 3 is a detail section on the line 3-3 of Figure 1.

As shown, the device has a frame 1 of tubular nature, with `feet 2, andan air inlet pipe 3. No air valve is shown, as this Iwill ordinarily bein the air *pipe atvsome convenient point to the operator, of themachine.

The lower portion ot' the casing serves as a cylinder, as at 1, for apiston 5. The cylinder is provided with air outlets 6 above the upwardlimit oi' the path'olv the piston, and it has also a head 4 throughwhich the piston rod passes. y

The piston rod 7 carries across head 8, suitablyguided over a pair ofrods 9, 9, that are set inside ofthe casing atan open portion 10thereof.

The rods 9 have collars 11 thereon, said` collars havingset screws 12`fory positioning them at the kdesired lined point along ,the

rods, thereby limiting the upward and downward strokes ofthe cross headand piston. rlhe pistonrod, as shown, is secured to the cross head byvpassing through thesame centrally and being held. in adjusted positionby nuts 13.

They cross head alsohasan arm 14 extend`r ing out through the casingwhere it is mounted on a slide rod 15, that reciprocates in a socketpiece 16 in the, top 17 of kthe.

frame. The rod acts as an indicator' to show the operator the upperand,lower limit of the stroke ot the piston.

Set into the center 'of thetop of the casing is a cylindrical piece 18having a flange 19, which iscountersunk into the said top. At what maybe termed the rear of thisl iiange is a pivot post 20, which carries thetwo half cylindrical portions 21 and `22 oli the core box hinged theretobelow, while the upper portions of the two,v halt' cylinders areprovided with ears in alignment with the pivot post for hingingfthe halfcylinders together .at the upper' end. The top 17 is slotted at k23 andthe cylinder 18 has lugs 18a to slide down through the slots. The lugswill then be turned by revolving the cylinder to bring them up againststop pins 28, depending from the top, thus securely fastening down thecylinder and flange.

One of the halves of the core box is provided with a pivot bolt 24 Jfora cover 25, which said cover has a notched portion 26a to engage over abolt 26 on the other half of the box. This second half has a latch 27thereon to engage down over an ear 28 on the half carrying the lid.

Thus when the boX is closed and the cover swung over the assembly andthe latch' thrown, the two halves of the core box will be securely heldtogether and will form a continuation, interiorly, ot the diameter ofthe cylinder 18.

The end of the piston rod is equipped with a detachable cap 29, which isof smaller diameter than the cylinder 18 and the core box. This cap isadapted tor acting as a seat for an annular plate 30, having a flange 3lto engage down over the head.

The cap has a threaded hole 81a in the upper end thereof, into which isscrewed. the vent plunger 32 for the core to be made.

The annular plate and particularly the vent plunger are to be changeddependent upon the special core that it is desired to make. The plate isof the diameter of the core box that is in use, and of the cylinder 18that is in use. The head or cap 29 is also adapted for change dependentupon the piece of work to be done and the size of the cylinder 18 to beused therewith.

The machine operates as follows: First selecting the desired ventplunger and arranging the cylinder 18, core box and annular plate Jforthe special work to be done, the operator adjusts the collars thatcontrol the length of stroke of the piston. He then lowers the piston tothe bottom of its stroke, and closes the core box, leaving the top open.Into this open top he places the sand, having latched the halves of thebox, and swings the lid into place. An opening of the air valve willthen cause the piston rod to rise and will force the annular plate andvent plunger up into the sand, to form the core.

After the core is formed, the box is opened and the core removed, afterwhich the piston is again depressed and the work con tinued.

I have not shown the air valve, but it will be understood that this maybe a toot treadle operated valve, having a position of compressed airinlet into the cylinder and a position of escape for the air Jfrom thecylinder into t-he atmosphere. In compound machines worked out on theprinciple above described, the piston operation may well be both upwardand downward, by utilizing any well known 'form ot compressed aircreased within limits of the number convenient to single operators.

I have not shown or described any such forms, as it is my desire in thisapplication to show and describe a simple form of core molding machine,which is positive in its operation and easy to fill with sand and toremove the completed core, as well as easy to change so as to makedifferent forms of core.

Having thus described my invention, what l claim as new and desire tosecure by Letters Patent, is r- 1. In a machine for making cores, thecombination with a driven piston, oit' a cylindrical element, and areciprocating element therein, comprising in part a vent plunger or thelike, driven by said piston, a closable filling opening in the cylinderelement for sand, and means for opening the cylinder element laterallyfor removal of completed cores, said machines having means foradjustably limiting the stroke of the piston.

2. ln a machine for making cores, the combination with a driven piston,of a cylindrical element, and a reciprocating element therein,comprising in part a vent plunger or the like, driven by said piston, aclosable illing opening in the cylinder element for sand, and means foropening the cylinder element laterally for removal of complete cores,said machine having a visible indicator to show the length of movementof the reciprocating element.

3. In a machine for making cores, the combination with a driven piston,of a core box formed to open laterally for removal of work, means forpositioning the core box removably on the machine, a rod on the pistonreciprocating in the core box and a detachable element on the rodadapted to serve as a piston in the core box, said element comprising inpart a vent plunger or the like, said core box having an opening at thetop for filling and a lid element, adapted to be secured fast over saidopening, during operation of the machine.

FRED ZOLL.

